drivers/staging/dream/qdsp5/audio_amrnb.c

   1 /* linux/arch/arm/mach-msm/qdsp5/audio_amrnb.c
   2  *
   3  * amrnb audio decoder device
   4  *
   5  * Copyright (c) 2008 QUALCOMM USA, INC.
   6  *
   7  * Based on the mp3 native driver in arch/arm/mach-msm/qdsp5/audio_mp3.c
   8  *
   9  * Copyright (C) 2008 Google, Inc.
  10  * Copyright (C) 2008 HTC Corporation
  11  *
  12  * All source code in this file is licensed under the following license except
  13  * where indicated.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License version 2 as published
  17  * by the Free Software Foundation.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * See the GNU General Public License for more details.
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, you can find it at http://www.fsf.org
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/fs.h>
  30 #include <linux/miscdevice.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/kthread.h>
  33 #include <linux/wait.h>
  34 #include <linux/dma-mapping.h>
  35
  36 #include <linux/delay.h>
  37
  38 #include <asm/atomic.h>
  39 #include <asm/ioctls.h>
  40 #include <mach/msm_adsp.h>
  41 #include <linux/msm_audio.h>
  42 #include "audmgr.h"
  43
  44 #include <mach/qdsp5/qdsp5audppcmdi.h>
  45 #include <mach/qdsp5/qdsp5audppmsg.h>
  46 #include <mach/qdsp5/qdsp5audplaycmdi.h>
  47 #include <mach/qdsp5/qdsp5audplaymsg.h>
  48
  49 /* for queue ids - should be relative to module number*/
  50 #include "adsp.h"
  51
  52 #define DEBUG
  53 #ifdef DEBUG
  54 #define dprintk(format, arg...) \
  55 printk(KERN_DEBUG format, ## arg)
  56 #else
  57 #define dprintk(format, arg...) do {} while (0)
  58 #endif
  59
  60 #define BUFSZ 1024 /* Hold minimum 700ms voice data */
  61 #define DMASZ (BUFSZ * 2)
  62
  63 #define AUDPLAY_INVALID_READ_PTR_OFFSET 0xFFFF
  64 #define AUDDEC_DEC_AMRNB 10
  65
  66 #define PCM_BUFSZ_MIN 1600 /* 100ms worth of data */
  67 #define AMRNB_DECODED_FRSZ 320 /* AMR-NB 20ms 8KHz mono PCM size */
  68 #define PCM_BUF_MAX_COUNT 5     /* DSP only accepts 5 buffers at most
  69                                    but support 2 buffers currently */
  70 #define ROUTING_MODE_FTRT 1
  71 #define ROUTING_MODE_RT 2
  72 /* Decoder status received from AUDPPTASK */
  73 #define  AUDPP_DEC_STATUS_SLEEP 0
  74 #define  AUDPP_DEC_STATUS_INIT  1
  75 #define  AUDPP_DEC_STATUS_CFG   2
  76 #define  AUDPP_DEC_STATUS_PLAY  3
  77
  78 struct buffer {
  79         void *data;
  80         unsigned size;
  81         unsigned used;          /* Input usage actual DSP produced PCM size  */
  82         unsigned addr;
  83 };
  84
  85 struct audio {
  86         struct buffer out[2];
  87
  88         spinlock_t dsp_lock;
  89
  90         uint8_t out_head;
  91         uint8_t out_tail;
  92         uint8_t out_needed;     /* number of buffers the dsp is waiting for */
  93
  94         atomic_t out_bytes;
  95
  96         struct mutex lock;
  97         struct mutex write_lock;
  98         wait_queue_head_t write_wait;
  99
 100         /* Host PCM section */
 101         struct buffer in[PCM_BUF_MAX_COUNT];
 102         struct mutex read_lock;
 103         wait_queue_head_t read_wait;    /* Wait queue for read */
 104         char *read_data;        /* pointer to reader buffer */
 105         dma_addr_t read_phys;   /* physical address of reader buffer */
 106         uint8_t read_next;      /* index to input buffers to be read next */
 107         uint8_t fill_next;      /* index to buffer that DSP should be filling */
 108         uint8_t pcm_buf_count;  /* number of pcm buffer allocated */
 109         /* ---- End of Host PCM section */
 110
 111         struct msm_adsp_module *audplay;
 112
 113         struct audmgr audmgr;
 114
 115         /* data allocated for various buffers */
 116         char *data;
 117         dma_addr_t phys;
 118
 119         uint8_t opened:1;
 120         uint8_t enabled:1;
 121         uint8_t running:1;
 122         uint8_t stopped:1;      /* set when stopped, cleared on flush */
 123         uint8_t pcm_feedback:1;
 124         uint8_t buf_refresh:1;
 125
 126         unsigned volume;
 127
 128         uint16_t dec_id;
 129         uint32_t read_ptr_offset;
 130 };
 131
 132 struct audpp_cmd_cfg_adec_params_amrnb {
 133    audpp_cmd_cfg_adec_params_common     common;
 134    unsigned short                       stereo_cfg;
 135 } __attribute__((packed)) ;
 136
 137 static int auddec_dsp_config(struct audio *audio, int enable);
 138 static void audpp_cmd_cfg_adec_params(struct audio *audio);
 139 static void audpp_cmd_cfg_routing_mode(struct audio *audio);
 140 static void audamrnb_send_data(struct audio *audio, unsigned needed);
 141 static void audamrnb_config_hostpcm(struct audio *audio);
 142 static void audamrnb_buffer_refresh(struct audio *audio);
 143 static void audamrnb_dsp_event(void *private, unsigned id, uint16_t *msg);
 144
 145 /* must be called with audio->lock held */
 146 static int audamrnb_enable(struct audio *audio)
 147 {
 148         struct audmgr_config cfg;
 149         int rc;
 150
 151         dprintk("audamrnb_enable()\n");
 152
 153         if (audio->enabled)
 154                 return 0;
 155
 156         audio->out_tail = 0;
 157         audio->out_needed = 0;
 158
 159         cfg.tx_rate = RPC_AUD_DEF_SAMPLE_RATE_NONE;
 160         cfg.rx_rate = RPC_AUD_DEF_SAMPLE_RATE_48000;
 161         cfg.def_method = RPC_AUD_DEF_METHOD_PLAYBACK;
 162         cfg.codec = RPC_AUD_DEF_CODEC_AMR_NB;
 163         cfg.snd_method = RPC_SND_METHOD_MIDI;
 164
 165         rc = audmgr_enable(&audio->audmgr, &cfg);
 166         if (rc < 0)
 167                 return rc;
 168
 169         if (msm_adsp_enable(audio->audplay)) {
 170                 pr_err("audio: msm_adsp_enable(audplay) failed\n");
 171                 audmgr_disable(&audio->audmgr);
 172                 return -ENODEV;
 173         }
 174
 175         if (audpp_enable(audio->dec_id, audamrnb_dsp_event, audio)) {
 176                 pr_err("audio: audpp_enable() failed\n");
 177                 msm_adsp_disable(audio->audplay);
 178                 audmgr_disable(&audio->audmgr);
 179                 return -ENODEV;
 180         }
 181         audio->enabled = 1;
 182         return 0;
 183 }
 184
 185 /* must be called with audio->lock held */
 186 static int audamrnb_disable(struct audio *audio)
 187 {
 188         dprintk("audamrnb_disable()\n");
 189         if (audio->enabled) {
 190                 audio->enabled = 0;
 191                 auddec_dsp_config(audio, 0);
 192                 wake_up(&audio->write_wait);
 193                 wake_up(&audio->read_wait);
 194                 msm_adsp_disable(audio->audplay);
 195                 audpp_disable(audio->dec_id, audio);
 196                 audmgr_disable(&audio->audmgr);
 197                 audio->out_needed = 0;
 198         }
 199         return 0;
 200 }
 201
 202 /* ------------------- dsp --------------------- */
 203 static void audamrnb_update_pcm_buf_entry(struct audio *audio,
 204                 uint32_t *payload)
 205 {
 206         uint8_t index;
 207         unsigned long flags;
 208
 209         spin_lock_irqsave(&audio->dsp_lock, flags);
 210         for (index = 0; index < payload[1]; index++) {
 211                 if (audio->in[audio->fill_next].addr ==
 212                     payload[2 + index * 2]) {
 213                         dprintk("audamrnb_update_pcm_buf_entry: in[%d] ready\n",
 214                                 audio->fill_next);
 215                         audio->in[audio->fill_next].used =
 216                             payload[3 + index * 2];
 217                         if ((++audio->fill_next) == audio->pcm_buf_count)
 218                                 audio->fill_next = 0;
 219
 220                 } else {
 221                         pr_err
 222                           ("audamrnb_update_pcm_buf_entry: expected=%x ret=%x\n"
 223                            , audio->in[audio->fill_next].addr,
 224                            payload[1 + index * 2]);
 225                         break;
 226                 }
 227         }
 228         if (audio->in[audio->fill_next].used == 0) {
 229                 audamrnb_buffer_refresh(audio);
 230         } else {
 231                 dprintk("audamrnb_update_pcm_buf_entry: read cannot keep up\n");
 232                 audio->buf_refresh = 1;
 233         }
 234
 235         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 236         wake_up(&audio->read_wait);
 237 }
 238
 239 static void audplay_dsp_event(void *data, unsigned id, size_t len,
 240                               void (*getevent) (void *ptr, size_t len))
 241 {
 242         struct audio *audio = data;
 243         uint32_t msg[28];
 244         getevent(msg, sizeof(msg));
 245
 246         dprintk("audplay_dsp_event: msg_id=%x\n", id);
 247
 248         switch (id) {
 249         case AUDPLAY_MSG_DEC_NEEDS_DATA:
 250                 audamrnb_send_data(audio, 1);
 251                 break;
 252
 253         case AUDPLAY_MSG_BUFFER_UPDATE:
 254                 audamrnb_update_pcm_buf_entry(audio, msg);
 255                 break;
 256
 257         default:
 258                 pr_err("unexpected message from decoder \n");
 259         }
 260 }
 261
 262 static void audamrnb_dsp_event(void *private, unsigned id, uint16_t *msg)
 263 {
 264         struct audio *audio = private;
 265
 266         switch (id) {
 267         case AUDPP_MSG_STATUS_MSG:{
 268                         unsigned status = msg[1];
 269
 270                         switch (status) {
 271                         case AUDPP_DEC_STATUS_SLEEP:
 272                                 dprintk("decoder status: sleep \n");
 273                                 break;
 274
 275                         case AUDPP_DEC_STATUS_INIT:
 276                                 dprintk("decoder status: init \n");
 277                                 audpp_cmd_cfg_routing_mode(audio);
 278                                 break;
 279
 280                         case AUDPP_DEC_STATUS_CFG:
 281                                 dprintk("decoder status: cfg \n");
 282                                 break;
 283                         case AUDPP_DEC_STATUS_PLAY:
 284                                 dprintk("decoder status: play \n");
 285                                 if (audio->pcm_feedback) {
 286                                         audamrnb_config_hostpcm(audio);
 287                                         audamrnb_buffer_refresh(audio);
 288                                 }
 289                                 break;
 290                         default:
 291                                 pr_err("unknown decoder status \n");
 292                                 break;
 293                         }
 294                         break;
 295                 }
 296         case AUDPP_MSG_CFG_MSG:
 297                 if (msg[0] == AUDPP_MSG_ENA_ENA) {
 298                         dprintk("audamrnb_dsp_event: CFG_MSG ENABLE\n");
 299                         auddec_dsp_config(audio, 1);
 300                         audio->out_needed = 0;
 301                         audio->running = 1;
 302                         audpp_set_volume_and_pan(audio->dec_id, audio->volume,
 303                                                  0);
 304                         audpp_avsync(audio->dec_id, 22050);
 305                 } else if (msg[0] == AUDPP_MSG_ENA_DIS) {
 306                         dprintk("audamrnb_dsp_event: CFG_MSG DISABLE\n");
 307                         audpp_avsync(audio->dec_id, 0);
 308                         audio->running = 0;
 309                 } else {
 310                         pr_err("audamrnb_dsp_event: CFG_MSG %d?\n", msg[0]);
 311                 }
 312                 break;
 313         case AUDPP_MSG_ROUTING_ACK:
 314                 dprintk("audamrnb_dsp_event: ROUTING_ACK mode=%d\n", msg[1]);
 315                 audpp_cmd_cfg_adec_params(audio);
 316                 break;
 317
 318         default:
 319                 pr_err("audamrnb_dsp_event: UNKNOWN (%d)\n", id);
 320         }
 321
 322 }
 323
 324 struct msm_adsp_ops audplay_adsp_ops_amrnb = {
 325         .event = audplay_dsp_event,
 326 };
 327
 328 #define audplay_send_queue0(audio, cmd, len) \
 329         msm_adsp_write(audio->audplay, QDSP_uPAudPlay0BitStreamCtrlQueue, \
 330                        cmd, len)
 331
 332 static int auddec_dsp_config(struct audio *audio, int enable)
 333 {
 334         audpp_cmd_cfg_dec_type cmd;
 335
 336         memset(&cmd, 0, sizeof(cmd));
 337         cmd.cmd_id = AUDPP_CMD_CFG_DEC_TYPE;
 338         if (enable)
 339                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC |
 340                     AUDPP_CMD_ENA_DEC_V | AUDDEC_DEC_AMRNB;
 341         else
 342                 cmd.dec0_cfg = AUDPP_CMD_UPDATDE_CFG_DEC | AUDPP_CMD_DIS_DEC_V;
 343
 344         return audpp_send_queue1(&cmd, sizeof(cmd));
 345 }
 346
 347 static void audpp_cmd_cfg_adec_params(struct audio *audio)
 348 {
 349         struct audpp_cmd_cfg_adec_params_amrnb cmd;
 350
 351         memset(&cmd, 0, sizeof(cmd));
 352         cmd.common.cmd_id = AUDPP_CMD_CFG_ADEC_PARAMS;
 353         cmd.common.length = AUDPP_CMD_CFG_ADEC_PARAMS_V13K_LEN;
 354         cmd.common.dec_id = audio->dec_id;
 355         cmd.common.input_sampling_frequency = 8000;
 356         cmd.stereo_cfg = AUDPP_CMD_PCM_INTF_MONO_V;
 357
 358         audpp_send_queue2(&cmd, sizeof(cmd));
 359 }
 360
 361 static void audpp_cmd_cfg_routing_mode(struct audio *audio)
 362 {
 363         struct audpp_cmd_routing_mode cmd;
 364         dprintk("audpp_cmd_cfg_routing_mode()\n");
 365         memset(&cmd, 0, sizeof(cmd));
 366         cmd.cmd_id = AUDPP_CMD_ROUTING_MODE;
 367         cmd.object_number = audio->dec_id;
 368         if (audio->pcm_feedback)
 369                 cmd.routing_mode = ROUTING_MODE_FTRT;
 370         else
 371                 cmd.routing_mode = ROUTING_MODE_RT;
 372
 373         audpp_send_queue1(&cmd, sizeof(cmd));
 374 }
 375
 376 static int audplay_dsp_send_data_avail(struct audio *audio,
 377                                        unsigned idx, unsigned len)
 378 {
 379         audplay_cmd_bitstream_data_avail cmd;
 380
 381         cmd.cmd_id = AUDPLAY_CMD_BITSTREAM_DATA_AVAIL;
 382         cmd.decoder_id = audio->dec_id;
 383         cmd.buf_ptr = audio->out[idx].addr;
 384         cmd.buf_size = len / 2;
 385         cmd.partition_number = 0;
 386         return audplay_send_queue0(audio, &cmd, sizeof(cmd));
 387 }
 388
 389 static void audamrnb_buffer_refresh(struct audio *audio)
 390 {
 391         struct audplay_cmd_buffer_refresh refresh_cmd;
 392
 393         refresh_cmd.cmd_id = AUDPLAY_CMD_BUFFER_REFRESH;
 394         refresh_cmd.num_buffers = 1;
 395         refresh_cmd.buf0_address = audio->in[audio->fill_next].addr;
 396         refresh_cmd.buf0_length = audio->in[audio->fill_next].size -
 397           (audio->in[audio->fill_next].size % AMRNB_DECODED_FRSZ);
 398         refresh_cmd.buf_read_count = 0;
 399         dprintk("audplay_buffer_fresh: buf0_addr=%x buf0_len=%d\n",
 400                 refresh_cmd.buf0_address, refresh_cmd.buf0_length);
 401         (void)audplay_send_queue0(audio, &refresh_cmd, sizeof(refresh_cmd));
 402 }
 403
 404 static void audamrnb_config_hostpcm(struct audio *audio)
 405 {
 406         struct audplay_cmd_hpcm_buf_cfg cfg_cmd;
 407
 408         dprintk("audamrnb_config_hostpcm()\n");
 409         cfg_cmd.cmd_id = AUDPLAY_CMD_HPCM_BUF_CFG;
 410         cfg_cmd.max_buffers = audio->pcm_buf_count;
 411         cfg_cmd.byte_swap = 0;
 412         cfg_cmd.hostpcm_config = (0x8000) | (0x4000);
 413         cfg_cmd.feedback_frequency = 1;
 414         cfg_cmd.partition_number = 0;
 415         (void)audplay_send_queue0(audio, &cfg_cmd, sizeof(cfg_cmd));
 416
 417 }
 418
 419 static void audamrnb_send_data(struct audio *audio, unsigned needed)
 420 {
 421         struct buffer *frame;
 422         unsigned long flags;
 423
 424         spin_lock_irqsave(&audio->dsp_lock, flags);
 425         if (!audio->running)
 426                 goto done;
 427
 428         if (needed) {
 429                 /* We were called from the callback because the DSP
 430                  * requested more data.  Note that the DSP does want
 431                  * more data, and if a buffer was in-flight, mark it
 432                  * as available (since the DSP must now be done with
 433                  * it).
 434                  */
 435                 audio->out_needed = 1;
 436                 frame = audio->out + audio->out_tail;
 437                 if (frame->used == 0xffffffff) {
 438                         frame->used = 0;
 439                         audio->out_tail ^= 1;
 440                         wake_up(&audio->write_wait);
 441                 }
 442         }
 443
 444         if (audio->out_needed) {
 445                 /* If the DSP currently wants data and we have a
 446                  * buffer available, we will send it and reset
 447                  * the needed flag.  We'll mark the buffer as in-flight
 448                  * so that it won't be recycled until the next buffer
 449                  * is requested
 450                  */
 451
 452                 frame = audio->out + audio->out_tail;
 453                 if (frame->used) {
 454                         BUG_ON(frame->used == 0xffffffff);
 455 /*                      printk("frame %d busy\n", audio->out_tail); */
 456                         audplay_dsp_send_data_avail(audio, audio->out_tail,
 457                                                     frame->used);
 458                         frame->used = 0xffffffff;
 459                         audio->out_needed = 0;
 460                 }
 461         }
 462  done:
 463         spin_unlock_irqrestore(&audio->dsp_lock, flags);
 464 }
 465
 466 /* ------------------- device --------------------- */
 467
 468 static void audamrnb_flush(struct audio *audio)
 469 {
 470         audio->out[0].used = 0;
 471         audio->out[1].used = 0;
 472         audio->out_head = 0;
 473         audio->out_tail = 0;
 474         audio->stopped = 0;
 475         atomic_set(&audio->out_bytes, 0);
 476 }
 477
 478 static void audamrnb_flush_pcm_buf(struct audio *audio)
 479 {
 480         uint8_t index;
 481
 482         for (index = 0; index < PCM_BUF_MAX_COUNT; index++)
 483                 audio->in[index].used = 0;
 484
 485         audio->read_next = 0;
 486         audio->fill_next = 0;
 487 }
 488
 489 static long audamrnb_ioctl(struct file *file, unsigned int cmd,
 490                 unsigned long arg)
 491 {
 492         struct audio *audio = file->private_data;
 493         int rc = 0;
 494
 495         dprintk("audamrnb_ioctl() cmd = %d\n", cmd);
 496
 497         if (cmd == AUDIO_GET_STATS) {
 498                 struct msm_audio_stats stats;
 499                 stats.byte_count = audpp_avsync_byte_count(audio->dec_id);
 500                 stats.sample_count = audpp_avsync_sample_count(audio->dec_id);
 501                 if (copy_to_user((void *)arg, &stats, sizeof(stats)))
 502                         return -EFAULT;
 503                 return 0;
 504         }
 505         if (cmd == AUDIO_SET_VOLUME) {
 506                 unsigned long flags;
 507                 spin_lock_irqsave(&audio->dsp_lock, flags);
 508                 audio->volume = arg;
 509                 if (audio->running)
 510                         audpp_set_volume_and_pan(audio->dec_id, arg, 0);
 511                 spin_unlock_irqrestore(&audio->dsp_lock, flags);
 512     return 0;
 513         }
 514         mutex_lock(&audio->lock);
 515         switch (cmd) {
 516         case AUDIO_START:
 517                 rc = audamrnb_enable(audio);
 518                 break;
 519         case AUDIO_STOP:
 520                 rc = audamrnb_disable(audio);
 521                 audio->stopped = 1;
 522                 break;
 523         case AUDIO_FLUSH:
 524                 if (audio->stopped) {
 525                         /* Make sure we're stopped and we wake any threads
 526                          * that might be blocked holding the write_lock.
 527                          * While audio->stopped write threads will always
 528                          * exit immediately.
 529                          */
 530                         wake_up(&audio->write_wait);
 531                         mutex_lock(&audio->write_lock);
 532                         audamrnb_flush(audio);
 533                         mutex_unlock(&audio->write_lock);
 534                         wake_up(&audio->read_wait);
 535                         mutex_lock(&audio->read_lock);
 536                         audamrnb_flush_pcm_buf(audio);
 537                         mutex_unlock(&audio->read_lock);
 538                         break;
 539                 }
 540
 541   case AUDIO_SET_CONFIG:{
 542       dprintk("AUDIO_SET_CONFIG not applicable \n");
 543                         break;
 544                 }
 545         case AUDIO_GET_CONFIG:{
 546                         struct msm_audio_config config;
 547                         config.buffer_size = BUFSZ;
 548                         config.buffer_count = 2;
 549                         config.sample_rate = 8000;
 550                         config.channel_count = 1;
 551                         config.unused[0] = 0;
 552                         config.unused[1] = 0;
 553                         config.unused[2] = 0;
 554                         config.unused[3] = 0;
 555                         if (copy_to_user((void *)arg, &config,
 556                                          sizeof(config)))
 557                                 rc = -EFAULT;
 558                         else
 559                                 rc = 0;
 560
 561                         break;
 562                 }
 563         case AUDIO_GET_PCM_CONFIG:{
 564                         struct msm_audio_pcm_config config;
 565                         config.pcm_feedback = 0;
 566                         config.buffer_count = PCM_BUF_MAX_COUNT;
 567                         config.buffer_size = PCM_BUFSZ_MIN;
 568                         if (copy_to_user((void *)arg, &config,
 569                                          sizeof(config)))
 570                                 rc = -EFAULT;
 571                         else
 572                                 rc = 0;
 573                         break;
 574                 }
 575         case AUDIO_SET_PCM_CONFIG:{
 576                 struct msm_audio_pcm_config config;
 577                 if (copy_from_user
 578                     (&config, (void *)arg, sizeof(config))) {
 579                         rc = -EFAULT;
 580                         break;
 581                 }
 582                 if ((config.buffer_count > PCM_BUF_MAX_COUNT) ||
 583                     (config.buffer_count == 1))
 584                         config.buffer_count = PCM_BUF_MAX_COUNT;
 585
 586                 if (config.buffer_size < PCM_BUFSZ_MIN)
 587                         config.buffer_size = PCM_BUFSZ_MIN;
 588
 589                         /* Check if pcm feedback is required */
 590                 if ((config.pcm_feedback) && (!audio->read_data)) {
 591                         dprintk("audamrnb_ioctl: allocate PCM buf %d\n",
 592                                         config.buffer_count *
 593                                         config.buffer_size);
 594                         audio->read_data =
 595                                 dma_alloc_coherent(NULL,
 596                                                        config.buffer_size *
 597                                                        config.buffer_count,
 598                                                        &audio->read_phys,
 599                                                        GFP_KERNEL);
 600                         if (!audio->read_data) {
 601                                 pr_err("audamrnb_ioctl: no mem for pcm buf\n");
 602                                 rc = -1;
 603                         } else {
 604                                 uint8_t index;
 605                                 uint32_t offset = 0;
 606                                 audio->pcm_feedback = 1;
 607                                 audio->buf_refresh = 0;
 608                                 audio->pcm_buf_count =
 609                                         config.buffer_count;
 610                                 audio->read_next = 0;
 611                                 audio->fill_next = 0;
 612
 613                                 for (index = 0;
 614                                 index < config.buffer_count; index++) {
 615                                         audio->in[index].data =
 616                                                 audio->read_data + offset;
 617                                         audio->in[index].addr =
 618                                             audio->read_phys + offset;
 619                                         audio->in[index].size =
 620                                             config.buffer_size;
 621                                         audio->in[index].used = 0;
 622                                         offset += config.buffer_size;
 623                                 }
 624                                 rc = 0;
 625                         }
 626                 } else {
 627                         rc = 0;
 628                 }
 629                 break;
 630         }
 631         default:
 632                 rc = -EINVAL;
 633         }
 634         mutex_unlock(&audio->lock);
 635         return rc;
 636 }
 637
 638 static ssize_t audamrnb_read(struct file *file, char __user *buf, size_t count,
 639                           loff_t *pos)
 640 {
 641         struct audio *audio = file->private_data;
 642         const char __user *start = buf;
 643         int rc = 0;
 644
 645         if (!audio->pcm_feedback)
 646                 return 0; /* PCM feedback is not enabled. Nothing to read */
 647
 648         mutex_lock(&audio->read_lock);
 649         dprintk("audamrnb_read() %d \n", count);
 650         while (count > 0) {
 651                 rc = wait_event_interruptible(audio->read_wait,
 652                                               (audio->in[audio->read_next].
 653                                                used > 0) || (audio->stopped));
 654
 655                 if (rc < 0)
 656                         break;
 657
 658                 if (audio->stopped) {
 659                         rc = -EBUSY;
 660                         break;
 661                 }
 662
 663                 if (count < audio->in[audio->read_next].used) {
 664                         /* Read must happen in frame boundary. Since driver does
 665                          * not know frame size, read count must be greater or
 666                          * equal to size of PCM samples
 667                          */
 668                         dprintk("audamrnb_read:read stop - partial frame\n");
 669                         break;
 670                 } else {
 671                         dprintk("audamrnb_read: read from in[%d]\n",
 672                                 audio->read_next);
 673                         if (copy_to_user
 674                             (buf, audio->in[audio->read_next].data,
 675                              audio->in[audio->read_next].used)) {
 676                                 pr_err("audamrnb_read: invalid addr %x \n",
 677                                        (unsigned int)buf);
 678                                 rc = -EFAULT;
 679                                 break;
 680                         }
 681                         count -= audio->in[audio->read_next].used;
 682                         buf += audio->in[audio->read_next].used;
 683                         audio->in[audio->read_next].used = 0;
 684                         if ((++audio->read_next) == audio->pcm_buf_count)
 685                                 audio->read_next = 0;
 686                 }
 687         }
 688
 689         if (audio->buf_refresh) {
 690                 audio->buf_refresh = 0;
 691                 dprintk("audamrnb_read: kick start pcm feedback again\n");
 692                 audamrnb_buffer_refresh(audio);
 693         }
 694
 695         mutex_unlock(&audio->read_lock);
 696
 697         if (buf > start)
 698                 rc = buf - start;
 699
 700         dprintk("audamrnb_read: read %d bytes\n", rc);
 701         return rc;
 702 }
 703
 704 static ssize_t audamrnb_write(struct file *file, const char __user *buf,
 705                            size_t count, loff_t *pos)
 706 {
 707         struct audio *audio = file->private_data;
 708         const char __user *start = buf;
 709         struct buffer *frame;
 710         size_t xfer;
 711         int rc = 0;
 712
 713         if (count & 1)
 714                 return -EINVAL;
 715         dprintk("audamrnb_write() \n");
 716         mutex_lock(&audio->write_lock);
 717         while (count > 0) {
 718                 frame = audio->out + audio->out_head;
 719                 rc = wait_event_interruptible(audio->write_wait,
 720                                               (frame->used == 0)
 721                                               || (audio->stopped));
 722                 dprintk("audamrnb_write() buffer available\n");
 723                 if (rc < 0)
 724                         break;
 725                 if (audio->stopped) {
 726                         rc = -EBUSY;
 727                         break;
 728                 }
 729                 xfer = (count > frame->size) ? frame->size : count;
 730                 if (copy_from_user(frame->data, buf, xfer)) {
 731                         rc = -EFAULT;
 732                         break;
 733                 }
 734
 735                 frame->used = xfer;
 736                 audio->out_head ^= 1;
 737                 count -= xfer;
 738                 buf += xfer;
 739
 740                 audamrnb_send_data(audio, 0);
 741
 742         }
 743         mutex_unlock(&audio->write_lock);
 744         if (buf > start)
 745                 return buf - start;
 746         return rc;
 747 }
 748
 749 static int audamrnb_release(struct inode *inode, struct file *file)
 750 {
 751         struct audio *audio = file->private_data;
 752
 753         dprintk("audamrnb_release()\n");
 754
 755         mutex_lock(&audio->lock);
 756         audamrnb_disable(audio);
 757         audamrnb_flush(audio);
 758         audamrnb_flush_pcm_buf(audio);
 759         msm_adsp_put(audio->audplay);
 760         audio->audplay = NULL;
 761         audio->opened = 0;
 762         dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 763         audio->data = NULL;
 764         if (audio->read_data != NULL) {
 765                 dma_free_coherent(NULL,
 766                                   audio->in[0].size * audio->pcm_buf_count,
 767                                   audio->read_data, audio->read_phys);
 768                 audio->read_data = NULL;
 769         }
 770         audio->pcm_feedback = 0;
 771         mutex_unlock(&audio->lock);
 772         return 0;
 773 }
 774
 775 static struct audio the_amrnb_audio;
 776
 777 static int audamrnb_open(struct inode *inode, struct file *file)
 778 {
 779         struct audio *audio = &the_amrnb_audio;
 780         int rc;
 781
 782         mutex_lock(&audio->lock);
 783
 784         if (audio->opened) {
 785                 pr_err("audio: busy\n");
 786                 rc = -EBUSY;
 787                 goto done;
 788         }
 789
 790         if (!audio->data) {
 791                 audio->data = dma_alloc_coherent(NULL, DMASZ,
 792                                                  &audio->phys, GFP_KERNEL);
 793                 if (!audio->data) {
 794                         pr_err("audio: could not allocate DMA buffers\n");
 795                         rc = -ENOMEM;
 796                         goto done;
 797                 }
 798         }
 799
 800         rc = audmgr_open(&audio->audmgr);
 801         if (rc)
 802                 goto done;
 803
 804         rc = msm_adsp_get("AUDPLAY0TASK", &audio->audplay,
 805                 &audplay_adsp_ops_amrnb, audio);
 806         if (rc) {
 807                 pr_err("audio: failed to get audplay0 dsp module\n");
 808                 audmgr_disable(&audio->audmgr);
 809                 dma_free_coherent(NULL, DMASZ, audio->data, audio->phys);
 810                 audio->data = NULL;
 811                 goto done;
 812         }
 813
 814         audio->dec_id = 0;
 815
 816         audio->out[0].data = audio->data + 0;
 817         audio->out[0].addr = audio->phys + 0;
 818         audio->out[0].size = BUFSZ;
 819
 820         audio->out[1].data = audio->data + BUFSZ;
 821         audio->out[1].addr = audio->phys + BUFSZ;
 822         audio->out[1].size = BUFSZ;
 823
 824         audio->volume = 0x2000; /* Q13 1.0 */
 825
 826         audamrnb_flush(audio);
 827
 828         file->private_data = audio;
 829         audio->opened = 1;
 830         rc = 0;
 831 done:
 832         mutex_unlock(&audio->lock);
 833         return rc;
 834 }
 835
 836 static struct file_operations audio_amrnb_fops = {
 837         .owner = THIS_MODULE,
 838         .open = audamrnb_open,
 839         .release = audamrnb_release,
 840         .read = audamrnb_read,
 841         .write = audamrnb_write,
 842         .unlocked_ioctl = audamrnb_ioctl,
 843 };
 844
 845 struct miscdevice audio_amrnb_misc = {
 846         .minor = MISC_DYNAMIC_MINOR,
 847         .name = "msm_amrnb",
 848         .fops = &audio_amrnb_fops,
 849 };
 850
 851 static int __init audamrnb_init(void)
 852 {
 853         mutex_init(&the_amrnb_audio.lock);
 854         mutex_init(&the_amrnb_audio.write_lock);
 855         mutex_init(&the_amrnb_audio.read_lock);
 856         spin_lock_init(&the_amrnb_audio.dsp_lock);
 857         init_waitqueue_head(&the_amrnb_audio.write_wait);
 858         init_waitqueue_head(&the_amrnb_audio.read_wait);
 859         the_amrnb_audio.read_data = NULL;
 860         return misc_register(&audio_amrnb_misc);
 861 }
 862
 863 static void __exit audamrnb_exit(void)
 864 {
 865         misc_deregister(&audio_amrnb_misc);
 866 }
 867
 868 module_init(audamrnb_init);
 869 module_exit(audamrnb_exit);
 870
 871 MODULE_DESCRIPTION("MSM AMR-NB driver");
 872 MODULE_LICENSE("GPL v2");
 873 MODULE_AUTHOR("QUALCOMM Inc");